(dagster-cli-api-run-launcher-6) Make cli api run launcher configurable class
We are going want to be able to plug this into the instance configuration.
Do so. Use the existing tests to test that it works in the machinery.
Depends on D3048
Test Plan: BK
Reviewers: max, alangenfeld
Reviewed By: max
Differential Revision: https://dagster.phacility.com/D3051